CVE-2022-49786

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{"bugzilla": {"description": "kernel: blk-cgroup: properly pin the parent in blkcg_css_online", "id": "2363368", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363368"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nblk-cgroup: properly pin the parent in blkcg_css_online\nblkcg_css_online is supposed to pin the blkcg of the parent, but\n397c9f46ee4d refactored things and along the way, changed it to pin the\ncss instead. This results in extra pins, and we end up leaking blkcgs\nand cgroups."], "name": "CVE-2022-49786", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49786\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49786\nhttps://lore.kernel.org/linux-cve-announce/2025050121-CVE-2022-49786-bd75@gregkh/T"], "statement": "A resource leak was identified in blkcg_css_online() where the current css was pinned instead of its parent, leading to extra references and memory not being freed. This issue can only be triggered by privileged users with CAP_SYS_ADMIN rights and does not allow for privilege escalation or data leakage. The leak may slowly exhaust kernel memory in systems making frequent use of cgroups and block I/O throttling.", "threat_severity": "Moderate"}

{"created": "2025-06-24T09:51:38.539556+00:00", "updated": "2025-06-24T09:51:38.539606+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}